NDLI: Ex situ and in situ AFM investigations on the growth of the (100) face of KDP with different pH values

Content Provider	Springer Nature Link
Author	Cheng, Min Li, MingWei Guo, JinLi Cao, YaChao
Copyright Year	2010
Abstract	Through investigations on the growth of the (100) face of potassium dihydrogen phosphate (KDP) crystal by ex situ atomic force microscopy (AFM) with different pH values at different supersaturations at 40°C, it was found that the growth of crystal was controlled by step flow at lower supersaturations, and the morphologies of steps were different under different growth conditions. In addition, at the higher supersaturations, 2D nucleation mechanism controlled the growth. When the supersaturations were lower, the dislocation mechanism controlled the growth of crystal, and when σ ⩾0.05, 2D nucleation mechanism played a dominant role in the growth of the (100) face for pH=4.2 and pH=2.5. However, for pH=5.0, the dislocation mechanism also dominated the growth of crystal when the supersaturations were lower, but when σ ⩾0.03, the crystal growth was controlled by 2D nucleation mechanism. Through investigations on the step flow of the (100) face of KDP crystal by in situ AFM with different pH values at lower supersaturations at 25°C, the velocities of normal growth of the (100) face were estimated at different growth conditions by in situ AFM. It was found that when the pH value was 5.0, the normal growth rate was the fastest at the same supersaturation compared to the other pH values and screw dislocation mechanism controlled the crystal growth. In addition, we found that with the reduction of the supersaturation of the solution, the density of steps also decreased, the width of steps became larger. Finally, a phenomenon which was the obvious anisotropic growth of steps in the step flow was observed by in situ AFM at σ = 0.025 at pH=5.0.
Starting Page	1554
Ending Page	1561
Page Count	8
File Format	PDF
ISSN	16747321
Journal	Science in China Series E: Technological Sciences
Volume Number	53
Issue Number	6
e-ISSN	1862281X
Language	English
Publisher	SP Science China Press
Publisher Date	2010-06-16
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pH value KDP AFM step flow Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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